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Rasterizes the loaded clouds by projecting them inside a regular grid.
Optional settings are:

-VERT_DIR {0/1/2} to specify the projection dimension (0=X / 1=Y / 2=Z) - default is 2 (Z)
-PROJ {MIN/AVG/MAX} to specify how the altitude of each cell is computed (minimum, average or maximum altitude of the projected points). Default is AVG (average)
-SF_PROJ {MIN/AVG/MAX} to specify how the SF value(s) of each cell are computed (minimum, average or maximum of the projected points SF value(s)). Default is AVG (average)
-EMPTY_FILL {MIN_H/MAX_H/CUSTOM_H/INTERP} to specify how empty cells should be filled (MIN_H = min height / MAX_H = max height / CUSTOM_H = custom value - see CUSTOM_HEIGHT option below / INTERP = interpolate). Default behavior is 'leave cells empty'
-MAX_EDGE_LENGTH {value} to specify a maximum triangle edge length for interpolation (to be used with -EMPTY_FILL INTERP) - since version 2.12 only
-CUSTOM_HEIGHT {value} to define the custom height filling value (if the 'CUSTOM_H' strategy is used (see above)
-OUTPUT_CLOUD to output the result as a cloud (this is the default option if no other output format is defined)
-OUTPUT_MESH to output the result as a mesh
-OUTPUT_RASTER_Z to output the result as a geotiff raster (only altitudes, no RGB)
-OUTPUT_RASTER_Z_AND_SF to output the result as a geotiff raster (altitudes + all SFs by default, no RGB)
-OUTPUT_RASTER_RGB to output the result as a geotiff raster (RGB)
Notes:

if OUTPUT_CLOUD or OUTPUT_MESH is selected, the resulting entity will replace the original cloud in memory